Inflammatory bowel disease IBD affects mainly young people and places a heavy burden on populations due to the disease-related reduction of quality of life and capacity for work. Recent years have seen significant progress and a number of new insights in the pathogenesis, diagnosis and treatment of principal entities – ulcerative colitis and Crohn’s disease. In this book of eleven chapters, international experts provide a complete overview of inflammatory bowel disease, addressing genetics and pathophysiology, clinical features, characteristics and diagnosis, clinical course and complications, medical management and novel therapeutic approaches.